SS34 High-Speed Switching 3A 40V Schottky Diode DO214-AC

SS34 High-Speed Switching 3A 40V Schottky Diode DO214-AC is a critical surface-mount component specifically engineered for demanding power applications that require extremely fast switching and low power loss. This Schottky barrier rectifier features a low forward voltage drop, a key characteristic that consequently minimizes power dissipation and improves overall system efficiency compared to standard recovery diodes. Encased in the compact DO-214AC (SMA) surface-mount package, the SS34 handles a continuous average rectified current of 3A and sustains a reverse voltage of 40V. Furthermore, its high-speed switching capability (virtually instantaneous recovery time) makes it the ideal choice for high-frequency switching power supplies and DC/DC converters. You should utilize the SS34 diode to achieve superior performance and efficiency in power management circuits.

Key Features:

• Low Forward Voltage Drop (V_F): Exhibits a very low voltage drop during conduction, which significantly reduces power loss and heat generation.
• High-Speed Switching: Possesses a fast reverse recovery time (t_rr < 10 ns), making it suitable for high-frequency circuits (e.g., ≥ 500 kHz).
• High Current Capability: Capable of handling a 3.0 A average rectified current, providing robust performance in power lines.
• Guard Ring Protection: Incorporates an internal guard ring structure, which enhances reliability and improves immunity against reverse transients.
• Surface Mount Package: The compact DO-214AC (SMA) package optimizes space and facilitates automated assembly in modern PCBs.

Technical Specifications:

• Maximum Peak Reverse Voltage (V_RRM): 40 V
• Maximum Average Rectified Current (I_O): 3.0 A
• Maximum Forward Voltage (V_F): 0.5 V at 3.0 A (Typically 0.45 V)
• Maximum Reverse Leakage Current (I_R): 0.5 mA at 40 V
• Operating Junction Temperature (T_J): −55°C to +150°C
• Reverse Recovery Time (t_rr): < 10 ns (Ultra-fast switching)

Mechanical Specifications:

• Package Style: DO-214AC (SMA)
• Case Material: Molded plastic, UL 94 V-0 Flammability Classification
• Polarity: Color band denotes the cathode end
• Mounting: Surface Mount Technology (SMT)

Dimensions:

• Body Length (L): ≈ 4.0 mm
• Body Width (W): ≈ 2.6 mm
• Total Height (H): ≈ 2.1 mm (Maximum)
• Pad Size Compatibility: Designed for standard SMA footprints.

Pinout and Wiring:

• Anode (+): The unbanded side of the body; connects to the positive voltage source or the switching element output.
• Cathode (−): The side marked with a color band; connects to the load or the output side of the rectifier circuit.
• Wiring Note: Consequently, always observe the cathode band to ensure correct polarity, which is vital for preventing short circuits and component failure in a diode application.

Datasheet Reference:

• Download Vishay SS34 Schottky Diode Datasheet

Commonly Used in:

• Portable Electronics: Ideal for battery charging circuits in mobile phones and tablets due to high efficiency.
• Switching Power Supplies (SMPS): Used extensively in the secondary rectification stage of high-frequency power converters.
• LED Lighting Drivers: Providing efficient rectification and free-wheeling functions in compact LED power supplies.

Applications:

• Reverse Polarity Protection: Protecting sensitive circuitry from accidental voltage reversal while incurring minimal forward voltage drop.
• High-Frequency Rectification: Converting high-speed AC switching signals back to DC with minimal energy loss.
• Free-Wheeling Diode: Clamping voltage spikes caused by inductive loads (motors, relays) in DC/DC boost and buck converters. Therefore, the fast response prevents damage.

Equivalent Models:

• MBR340 (Similar Specs): A common 3A, 40V Schottky diode in a different package, however, it performs the same electrical function.
• SK34 (Taiwan Semiconductor): A direct cross-reference part number to the SS34, sharing the same key specifications and SMA package.
• SMCJ40A (Transient Suppressor): Note that this is a TVS diode and not a direct rectifier replacement, instead, use it for surge protection alongside the SS34.

Package Includes:

• 1 x SS34 3A 40V Surface Mount Schottky Diode (DO214-AC / SMA)